C Printing Heart Pattern

#include<stdio.h> 
  
int main() { 
    int a, b, line = 12; 
  
    for (a = line/2; a <= line; a = a+2) { //for the upper part of the heart
        for (b = 1; b < line-a; b = b+2) //create space before the first peak         
            printf(" "); 
   
        for (b = 1; b <= a; b++) //print the first peak
            printf("*"); 
   
        for (b = 1; b <= line-a; b++) //create space before the first peak
            printf(" "); 
           
        for (b = 1; b <= a-1; b++) //print the second peak
            printf("*"); 
        printf("\n"); 
    } 

    for (a = line; a >= 0; a--) { //the base of the heart is inverted triangle
        for (b = a; b < line; b++) //generate space before triangle
            printf(" "); 
  
        for (b = 1; b <= ((a * 2) - 1); b++) //print the triangle
            printf("*"); 
  
        printf("\n");   
    } 
}