feat: added formatNumber

utils/index.ts

@@ -1,5 +1,26 @@
 import * as Query from './Query'
 import * as Constants from './Constants'
 import ResponseWrapper from './ResponseWrapper'
+import Fetch from './Fetch'
 
-export { Query, Constants, ResponseWrapper }
+function formatNumber(num:number, digits=1) {
+	const si = [
+		{ value: 1, symbol: '' },
+		{ value: 1E3, symbol: '천' },
+		{ value: 1E4, symbol: '만' },
+		{ value: 1E8, symbol: '억' },
+		{ value: 1E12, symbol: '조' },
+		{ value: 1E16, symbol: '해' }
+	]
+	const rx = /\.0+$|(\.[0-9]*[1-9])0+$/
+	let i
+	for (i = si.length - 1; i > 0; i--) {
+		if (num >= si[i].value) {
+			break
+		}
+	}
+	return (num / si[i].value).toFixed(digits).replace(rx, '$1') + si[i].symbol
+}
+
+
+export { Query, Constants, Fetch, ResponseWrapper, formatNumber }