[c language] compress strings and add markup characters

1、 subject

Xiaoke recently studied the string compression tag problem , He wants to insert a marker character before a specified character in a given string , If the specified characters appear continuously, you need to compress the continuous characters into 1 Characters plus the number of occurrences , Both the specified character and the marking character are entered from the keyboard . Please help him solve this need .

【 Input form 】 Enter the main string s（ The length is less than 100）, Enter the specified character t, Enter marker character c.

【 Output form 】 Output the inserted string

Examples 1：

Input ：
abbcabcde
b
*
Output ：
a* b2ca* bcde

Examples 2：

Input ：
abbcbbbe
b
c
Output ：
acb2ccb3e

2、 Complete code

#define _CRT_SECURE_NO_WARNINGS // Visual Studio The version is too new and needs to be added 
#include <stdio.h>
#define N 100
char res[N];

//  Compress string 
int Compress(char* arr)
{
    
	int i = 0;
	int j = 0;
	int cout = 1;
	while (arr[i] != '\0')
	{
    
		if (arr[i] == arr[i + 1])
		{
    
			cout++;
		}
		else
		{
    
			if (cout == 1) {
    
				arr[j++] = arr[i];
			}
			else if (cout != 1) {
    
				arr[j++] = arr[i];
				arr[j++] = cout + '0';
			}
			cout = 1;
		}
		i++;
	}
	arr[j] = '\0';
}

// Add marker character 
char* InsertStr(char* s, char t, char c)
{
    
	int length = strlen(s);
	int i = 0;
	int count = 0;
	while (i < length)
	{
    

		if (s[i] == t)
		{
    
			res[count++] = c;
		}
		res[count++] = s[i];
		i++;
	}
	if (s[length - 1] == t) {
    
		res[count++] = c;
	}
	res[count] = '\0';
	return res;
}

int main()
{
    
	char a[100], b, c;
	gets(a);
	Compress(a);
	b = getchar();
	scanf("\n");
	c = getchar();
	char* p = InsertStr(a, b, c);
	puts(p);
	return 0;
}

3、 Screenshot