fix(sdk): split check for empty string (#125)

Author: kevzzsk

packages/sdk/src/utils/index.ts

@@ -293,7 +293,7 @@ export const splitInscriptionId = (inscriptionId: string) => {
     throw new OrditSDKError(`Invalid inscriptionId: ${inscriptionId}`)
   }
   const indexNum = Number(index)
-  if (Number.isNaN(indexNum) || indexNum < 0 || index !== "") {
+  if (Number.isNaN(indexNum) || indexNum < 0 || index === "") {
     throw new OrditSDKError(`Invalid inscriptionId: ${inscriptionId}`)
   }