diff --git a/wordrepl.c b/wordrepl.c
new file mode 100644
index 0000000..2365c3d
--- /dev/null
+++ b/wordrepl.c
@@ -0,0 +1,135 @@
+/*
+
+1. Einlesen einer Zeichenkette
+2. Bestimmtes Wort kann durch ein anderes eretzt werden
+3. Alle vorkommen des ausgewählten Wortes werden in der gesamten
+   Zeichenkette automatisch durch das neue Wort ersetzt
+4. Ausgabe der neuen Zeichenkette
+
+
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#define MAX_LENGTH 101
+#define MAX_WORD_LENGTH 11
+#define MAX_EXCHANGE_WORD_LENGTH 21
+#define MAX_POSITION 10
+
+void get_input_string(char * input ) {
+  printf("Geben Sie einen Text mit maximal %d Zeichen ein: ", MAX_LENGTH-1);
+  scanf("%100[^\n]", input);
+  while (getchar() != '\n');
+}
+
+void get_word_to_replace(char*get_word) {
+  printf("Welches Wort soll ersetzt werden? (Maximale Wortlänge:  %d): ", MAX_WORD_LENGTH-1);
+  scanf("%10[^\n]", get_word);
+  while (getchar() != '\n');
+}
+
+void get_new_word(char*new_word) {
+  printf("Durch welches Wort soll dieses ersetzt werden? (Maximale Wortlänge des neuen Wortes: %d): ", MAX_EXCHANGE_WORD_LENGTH-1);
+  scanf("%20[^\n]", new_word);
+  while (getchar() != '\n');
+}
+
+int find_word_positions(const char *input_sentence, const char *target_word, int position_target_word[]) {
+
+    int counter_word_found = 0;
+
+    char *sentence_ptr = (char*)input_sentence;
+
+    if(strstr(sentence_ptr, target_word) == NULL) {
+        return 0;
+    }
+    do{
+        char *ptr_position_target_word = strstr(sentence_ptr, target_word);
+
+        int position_before_target_word = ptr_position_target_word - input_sentence - 1;
+
+        int position_after_target_word = ptr_position_target_word - input_sentence + strlen(target_word);
+
+        if (isalpha(input_sentence[position_before_target_word]) || isalpha(input_sentence[position_after_target_word])) {
+            sentence_ptr = ptr_position_target_word + strlen(target_word);
+        }
+        else {
+            position_target_word[counter_word_found] = ptr_position_target_word - input_sentence;
+
+            sentence_ptr = ptr_position_target_word + strlen(target_word);
+
+            counter_word_found++;
+        }
+    }while(strstr(sentence_ptr, target_word) != NULL);
+
+    return counter_word_found;
+}
+
+void replace_word_in_sentence(char *input_sentence, const char *replacement_word, const char *target_word, int positions_target_word[], int counter_word_found) {
+
+    char updated_sentence[MAX_LENGTH] = {0};
+
+    int last_position = 0;
+
+    for (int i = 0; i < counter_word_found; i++) {
+
+        strncat(updated_sentence, input_sentence + last_position, positions_target_word[i] - last_position);
+
+        strncat(updated_sentence, replacement_word, MAX_EXCHANGE_WORD_LENGTH - 1);
+
+        last_position = positions_target_word[i] + strlen(target_word);
+    }
+    strncat(updated_sentence, input_sentence + last_position, MAX_LENGTH - strlen(updated_sentence) - 1);
+
+    strncpy(input_sentence, updated_sentence, MAX_LENGTH - 1);
+    input_sentence[MAX_LENGTH] = '\0';
+}
+
+int main(void) {
+    char input_sentence[MAX_LENGTH] = {0};
+    char target_word[MAX_WORD_LENGTH] = {0};
+    char replacement_word[MAX_EXCHANGE_WORD_LENGTH] = {0};
+    int positions_target_word[MAX_POSITION] = {0};
+    char continue_choice;
+    int word_found = 0;
+
+
+    get_input_string(input_sentence);
+
+    do {
+        get_word_to_replace(target_word);
+
+        get_new_word(replacement_word);
+
+        word_found = find_word_positions(input_sentence, target_word, positions_target_word);
+
+        if (word_found == 0) {
+            printf("Wort nicht gefunden:\n");
+            printf("Der Satz lautet: %s\n", input_sentence);
+        }
+        else {
+            replace_word_in_sentence(input_sentence, replacement_word, target_word, positions_target_word, word_found);
+            printf("\n....: %s\n", input_sentence);
+        }
+
+            printf("Noch eine Einsetzung (j/n)? ");
+            continue_choice = getchar();
+            while (getchar() != '\n');
+
+    } while (continue_choice != 'n' && continue_choice != 'N');
+
+    return 0;
+}
+
+
+//
+// Created by Lennart Pecher on 25.04.25.
+//
+
+
+
+//
+// Created by Lennart Pecher on 25.04.25.
+//