Сделал всё

KRNumber3/KRNumber3/main.c

@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <locale.h>
+#include <string.h>
+#include <stdbool.h>
+
+bool scanFile(char fileName[], char arrayForTest[]) {
+	FILE* file = fopen(fileName, "r");
+	if (file == NULL) {
+		printf("Mistake!");
+		return false;
+	}
+	char data[100] = { '\0' };
+	int pointerTest = 0;
+	while (fscanf(file, "%s", data) == 1){
+		size_t sizeData = strlen(data);
+		if (sizeData >= 1) {
+			if (fileName != NULL && strcmp(fileName, "test.txt") != 0) {
+				printf("%c", data[0]);
+			} else {
+				if (arrayForTest[pointerTest] != data[0]) {
+					return false;
+				}
+				++pointerTest;
+			}
+		}
+		for (size_t i = 1; i < sizeData; ++i) {
+			if (data[i] != data[i - 1]) {
+				if (fileName != NULL && strcmp(fileName, "test.txt") != 0) {
+					printf("%c", data[i]);
+				} else {
+					if (arrayForTest[pointerTest] != data[i]) {
+						return false;
+					}
+					++pointerTest;
+				}
+			}
+		}
+	}
+	fclose(file);
+	return true;
+}
+
+bool test(){
+	char fileName[9] = "test.txt";
+	char arrayTest[4] = "abc";
+	return scanFile(fileName, arrayTest);
+}
+
+int main(void) {
+		setlocale(LC_ALL, "RUS");
+		if (test()) {
+			printf("Tests correct\n");
+		}
+		else {
+			printf("Mistake...\n");
+			return 0;
+		}
+		printf("Enter the file name and its extension, the size should not exceed 100 characters. You cannot enter a file named test.txt.\n");
+		char fileName[100] = { '\0' };
+		int checkScan = scanf("%s", &fileName);
+
+		while (checkScan != 1 || fileName == NULL || strcmp(fileName, "test.txt") == 0) {
+			while (getchar() != '\n') {
+			}
+			printf("Mistake...Try again\n");
+			checkScan = scanf("%s", &fileName);
+		}
+		if (!scanFile(fileName, NULL)) {
+			printf("Mistake...\n");
+			return -1;
+		}
+	}

KRNumber3/KRNumber3/test.txt

@@ -0,0 +1 @@
+aabbcc