Answer L35

#include <stdio.h>

void center(char ch, int count, int length)
{
  int blanks = length-count;
  int j;
  
  for ( j=0; j<blanks/2; j++ ) putchar( ' ' );
  for ( j=0; j<count;    j++ ) putchar( ch );
  
  putchar( '\n');
}

void starBlock( int r, int c, int lineSize )
{
  int j;
  for ( j=0; j<r; j++ )
    center( '*', c, lineSize );
}

void pyramid( int blocks )
{
  int b=0;
  int lineSize = 2*blocks-1;
  
  for ( b=1; b<=blocks; b++ )
    starBlock( b, 2*b-1, lineSize );
}

int main()
{
  pyramid( 5 );  
  return 0;
}

Comments: The base of the pyramid is (2*blocks-1) characters wide. Use that as the linesize for all lines of the picture.