C Program to implement strlen function

Write a c program to find the length of a string without using the built-in function strlen(). Program will calculate the length of the string using for loop by going through each character of the string, till its end. Read more about C Programming Language .
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#include <stdio.h>

void main()
{
char string[50];
int i, length = 0;

printf("Enter a stringn");
gets(string);

for (i=0; string[i] != '