Driver Code
class geek { public static int Main ( ) { gfg g = new gfg ( ) ; string input = "2 ▁ * ▁ pi ▁ + ▁ 3 ▁ * ▁ pi ▁ = ▁ 5 ▁ * ▁ pi " ; Console . WriteLine ( g . replacePi ( input ) ) ; return 0 ; } }