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for javascript

nnoremap <F5> :FloatermNew node %<CR>

for c

nnoremap <F5> :FloatermNew gcc % && ./a.out<CR>

for c++

nnoremap <F5> :FloatermNew g++ % && ./a.out<CR>

for python

nnoremap <F5> :Floaterm python3 %<CR>

Now i want that these all working with one shortcut F5.

i done like this but get an error

nnoremap <expr> <F5> My_mapping()

function! My_mapping
    if &filetype ==# 'c'
        nnoremap <F5>:FloatermNew gcc % && ./a.out <CR>
    elseif &filetype ==# 'c++'
        nnoremap <F5>:FloatermNew g++ % && ./a.out <CR>
    elseif &filetype ==# 'js'
        nnoremap <F5>:FloatermNew node % <CR>
    elseif &filetype ==# 'py'
        nnoremap <F5>:FloatermNew python3 % <CR>
    else
        nnoremap <F5><CR>
    endif
endfunction

error

Error detected while processing /home/visrut/.config/nvim/init.vim:
line  208:
E123: Undefined function: My_mapping
n  <F5>        * My_mapping()
line  220:
E193: :endfunction not inside a function

can anyone fix error?