Inputting symbols and placeholders like £, $ and %

[juba666]

Describe the bug
Inputting symbols and placeholders like £ , $ and % bypasses validation rules

To Reproduce
Steps to reproduce the behavior:

1. Open cic.go and choose choice 1
2. Input 0 for Principal Amount
3. Input £0 for Principal Amount

Expected behavior
First input triggers error and goto pa works, second input triggers error message but doesnt goto pa, instead skips to else statement

func calcFA() {
var p float64
var s string
var n float64
var r float64
pa:
fmt.Print("Enter a Principal Amount(£): ")
fmt.Scanf("%f\n", &p)
if !(p > 0) {
        fmt.Println("ERROR: you did not enter a number greater than zero, or included a symbol")
		goto pa
} else {

[juba666]

I tried strings.ContainsRune function but still needs work
commit: cd7ba3b

import (
"strings"
)
...
...
...
fmt.Print("Enter a Principal Amount(£): ")
fmt.Scanf("%f\n", &p)
tp := fmt.Sprintf("%f", p)
if !(p > 0) || ((strings.ContainsRune(tp, '\u00a3')) || ((strings.ContainsRune(tp, '$')))) {
        fmt.Println("ERROR: you did not enter a number greater than zero, or included a currency symbol")
		calcFA()
} else {

[juba666]

[FIXED]

pa:
fmt.Print("Enter a Principal Amount(£): ")
fmt.Scanf("%f\n", &p)
sp := fmt.Sprintf("%f", p)
if !(p > 0) || ((strings.ContainsRune(sp, '\u00a3')) || ((strings.ContainsRune(sp, '$')))) {
        fmt.Println("ERROR: you did not enter a number greater than zero, or included a symbol")
		goto pa
} else {

[juba666]

$ and % still bypass condition :-/ but no problematic loops caused so this issue is not a priority