VIM secondary replacement

fun! Ecpp(a,c=' ')
let[a,b,c]=split(a:a,a:c)
" Separate , Divide into 3 strand , The first 1 String first condition , Separate with a single character 
" The first 2 strand " Quadratic matching .f Is a function name string ,m For mode 
let b=Wjxt(b,'"')
let c=Wjxt(c,'"')
let gs='%s/{}/\=TH(submatch(0),{},{})/g'
let ml=Thgs(gs,a,b,c)
" It's no use here Thgs2.
exe ml
endf