strip_zeroes.c

#include <stdio.h>
#include <string.h>

char* stripZeroes(char* buffer) {
    unsigned int length = strlen(buffer);

	//find the decimal, if it exists
	unsigned int decimal = 0;
	while (decimal != length && buffer[decimal] != '.') decimal++;

	//wipe the trailing zeros
	while(decimal != length && buffer[length-1] == '0') buffer[--length] = '\0';
	
	return buffer;
}

void check(char* arg) {
	char buffer[256];
	strncpy(buffer, arg, 256);
	char* result = stripZeroes(buffer);
	printf("%s : %s\n", arg, result);
}

int main(int arc, char* argv[]) {   
	check("123");
	check("1230");
	check("123.45");
	check("123.4500");
	check("123.004500");
	check("123.0045");

    return 0;
}