Add clear button to topic search

app/src/components/helper/ClearAdornment.tsx

@@ -0,0 +1,25 @@
+import * as React from 'react'
+import { IconButton } from '@material-ui/core'
+import Clear from '@material-ui/icons/Clear'
+
+interface Props {
+  value?: string
+  action: any
+  style?: React.CSSProperties
+}
+
+class ClearAdornment extends React.Component<Props, {}> {
+  public render() {
+    if (this.props.value) {
+      return (
+        <IconButton style={{ ...this.props.style, padding: '1px' }} onClick={this.props.action}>
+          <Clear style={{ fontSize: '16px' }} />
+        </IconButton>
+      )
+    }
+
+    return null
+  }
+}
+
+export default ClearAdornment